Material or composition and article made therefrom.



aUeUsTE ROBERT MI'TLLER, or LoNnon, ENGLAND, ssronon TO B. M. D. SYNDICATE,

LIMITED, OF LONDON, ENGLAND.

MATERIAL OR COMPOSITION AND ARTICLE MADE THEREFROM.

1,022,495. No Drawing.

1! '0 all whom it'may concern: I

Be it known that I, AUoUsTr. ROBERT Mt' L- fun, a subject of the -German Emperor, residing at 45 Ashburnham Mansions, Chelsea, London, England, have invented an Improved Material or Composition and Article Made Therefrom, of which the following a specification. 7 This invention relates 'to an improved material or composition which is especially applicable to the manufacture ofvarious articles for electrical insulating purposes but which may be used for various other articles such as stoppers for bottles. It has before been proposed to form such material from asbestos and pitch or asphalt, benzol or phenol being used as solvents for the pitch or asphalt, such compositions however are affected by heat and are not sufiiciently uninflammable and non -'hygroscopic for use as electric insulation materials. It

has also been proposed to make a plas-.

tic and hardenablesubstance by stirring into heated tar any one of the following substances: minerals, ground sand, dry earth, pieces of glass, scraps of iron, slag, asbestos, wood, shavings, rags, paper, wool, cotton and hair.

According to this invention asbestos oras-' be used for electrical insulation the quantity of asbestos used is larger than that of the tar (preferably two parts to one); the asbestos and tar are mixed together and submitted to a heat of 400 to500 .C. preferably in the mixing machine, but for other purposes more tar and less heat may be used. After the mixture has cooled it is preferably reduced to powder which is reheated before compressing or molding. In carrying out this process I may use ordinary-gas works tar but I find that the best results are obtained with tar known as thick tar, such tar contains a smaller quantity of the heavy oils as compared with the quantity of pitch than ordinary gas works tar. The quantities of the light oils contained in gas works tar is very small, while only traces are found in thick tar.

The composition the subject of this inven- Specification of Letters Patent.

Patented Apr. 9, 1912.

application filed May 8, 1911 Serial No. 625,837.

tion is non-inflammable and non-hygroscopic and is eminently adapted for electric use. I I

The non-inflammability of the material described as containing the smaller proportion of tar and which is submitted to the greater heat, is attributable to the fact that the tar used only contains traces of inflammable constituents which together with the heavy oils are driven off by the high heat, whereas in the earlier suggested compositions above mentioned a solvent consisting of a highly inflammable oil was employed of which portions remained in the composition which was therefore inflammable to an extent sufiicient to render it unsafe for electrical purposes.

In carrying out this invention asbestos waste is placed in a heated kneading or mixing machine of any ordinary construction.

vWhen the asbestosis thoroughly warmed tar of the quality specified above is added in the proportions indicated above according to the material required and the heat is then raised to the required temperature, for about one hour, sometimes more and sometimes less.

The mixture is removed from the mixer and allowed to cool, after which it is preferably reduced to powder. The powder isreheated and molded in a heated mold.

What I claim is r 1. A material produced by mixing together asbestos and tar containing a relatively small quantity of inflammable oil, and heating the said mixture to 250 C. or

mable constituents have been driven off. v

2. A material produced by mixing together asbestos and tar containing a'relatively small quantity of inflammable oil in proportions ranging from equal parts by weight of asbestos and tar to two parts by weight of asbestos to one of tar and heating said mixture to 250 C. or over until sub-' stantially all of the inflammable constituents have been driven off.

3. An article of manufacture produced by mixing together asbestos and tar containing a relatively small quantity of inflammable oil, heating the said mixture to 250 C. or over until substantially all of the inflammable constituents have been driven off, re-

ducing the product to a powder and then compressing the same. 4. An article of manufacture produced by mixing together asbestos and tar containing over until substantially all of the inflam- 9 a-relatively small quantity of inflammable oil in proportions ranging from equal parts by weight of asbestos to two parts of asbestos to one of tar, heating said mixture to 250 C. or over until substantially all of the inflammable constituents have been driven off and which has been molded or compressed.

5.- The method herein described, which consists in mixing together asbestos and tar containing a' relatively small quantity of inflammable oil and heating the said mixture to 250. C. or over until substantially all of the inflammable constituents have been driven off.

- 6. The method herein-described which con sists in mixing together asbestos and tar con taining a relatively small quantity of inflamv mable material in proportions ranging from equal parts by weight of-asbes tos and tar to two parts by weight of asbestos and one of tar, and heating said mixture to 250 C. or over until substantially all of the inand asbestos in proportions ranging from equal parts by weight of asbestos and tar.

to two parts by weight of asbestos to one of tar, heating the same to 250 C. or over until theinflammable. constituents and heavy oils have been driven off, reducing the product to a powder, and molding the same.

AUGUSTE ROBERT'MI'ITLLER.

Witnesses:

.RIPLEY WILSON,

J. HOWLING. 

